Brake anchor



Aug. 27, 1929. J, SNEEDr 1,726,046

BRAKE ANCHOR' Filed June 14, 1927 Patented Aug. x2i, 1929.

UNITED STATES rom: sNEED, oF nn'rnorr, MICHIGAN, AssIGNoR To THE MIDLAND STEEL. PRODUCTS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO;

BiaAxn Ancnon.

Application filed June 14,

This invention relates to' brakes and more vparticularly to a mounting or anchorage for the brake shoe. A

Itis among the objects of my invention to providef a brake shoe which is designed to take advantage of the wrapping effect conferred upon the shoe by the drum and to take equal advantage'of this wrapping effect regardless of the direction of rotationof the Another object is to provide a mounting for brake shoes by means of which a circumferential force delivered to the shoe is transferred to a radial force which-forces the shoe directly against the frictionsurface of the drum.

Another object is to mount the shoe in a simple manner which will involve as few parts as possible and which is consistent with the design of a shoewliich can be cheaply .madefand quickly assembled. l A Ifurther object is to provide a shoe which canbe fitted to a brake ,drumK with a free clearance but which will give afuniform and satisfactory '25 operation without regard to wear or increase fin clearance during the life of the brake.

A .further` object Iisto mount and anchor the shoe so that radial pressurev is maintained.y

between the shoe and the drum not only between the anchoring means and the expanding device5 but also at .points near the anchoring means andparticularly at points beyond the anchoring means relative .to the wrapl ping portion of the shoen t A further object is to mountthe shoe so that the whole of the shoe will be used in the brake engagement and particularly that portion of the shoe which is ordinarily subjected` to an unwrapping effect.

Other objects will appear from .the following description of the apparatus constituting my invention; the essential charactern istics are-summarized in theclaims.

In the drawings Fig. 1 1s an elevation of the shoe mounted within a suitable drum; Fig. 2 is a section taken on lines 2-2 in Fig.- l; Fig. 3 is a .modified form of the mounting shown in Figs. 1 and 2. f

In carrying out the objects of my inven- :may be universally connected with the /shoetion, I show a suitable brake drum 1 in which is mounted a shoe 2. Suitable expanding` 1927. serial No. 198360.

\ 12 has, `of course, a lining Supporting portion 13 and upstanding flanges 15 in Fig. 2. In the center of' the flanges 15, a pair of aligned vertical. slots 16 are provided and in the ysame portion ofthe shoe'the enlarged 70 circumferential slotsf`-17 are provided.

Referring particularly to Fig. 2, an anchor pin 2O is mounted in a suitable bracket 21 selcured to the usual backing plate 22 so that the anchor pin extends through the channel portions of the shoe through the slots 17. The shoe is entirely .out of contact with the anchor pin by reason of the radial dimensiom of the slot being greater than the diameter of the pin. )In vthis manner, both the circumferential land radial movement of the shoe is permitted without contact with the anchor pin. r

show a double armed. member 30 having arms 31 extending circumferentially away from the anchor pin. These arms -vare leld in contact with the inner side of the lining supporting portion ofthe shoe by suitable springs 32.` These springs may be connected with the tops off the lianges 15a-nd tothearms ofthe member 30. Aconventional `retractor spring 35 is provided across the jfree ends of the shoe.V Suitable stop members 36 are shown adjacent portions of the shoes whichhave an arcuate surface concentric with the drum, so that the whole shoe may be `W'moved circumferentially when the ends of the shoes are spread, until the@l movement yis terminatedv by reason of the 100y rocking of the member 30 andthe engagement of the mid-portion of the shoe with the drum. The member 30 carries apin 40 which, in my preferred form, is disposed directly above the pin 12 andin radial alignment 105 therewith." lThe pin 40 is fixed to the member 30 by a suitable pin 41. The pin 40 extends through the opening 16 and is in contact with the lateral edges thereof, but is given a radial clearing so that the member 110V Pivotally mounted on the.` anchor pin, ^I l' 'slots 16.'

30 may rock about the pin 20 as an axis within the limits determined by the clearance of the mid-portion ofY the shoev from the f drum without bringing the pin Il@` into contact with the upper or lower edges f the In the modified form of my invention shown in Fig-s, the anchor pin 20A has ample clearance in .the slot 17A. A link 305 is pivoted on the anchor pin iny a mariner similar to the connection of the member 30 to the pin 20 as shown in Fig. 9. The link 30A carries a pin '40A pivotally connected to the shoe y tion. The. drum is free to rotate except for the connection to the anchor pin 20. I-Iowever, there will bea bodily rotation of the shoe until the member is rocked by reas-on of the engagement with the pin 40 in the slot 16 uny til the left arm of the member 3Q forces the mid-portion of the shoe directly into engage- 1 ment with the drum at or about the point A.

In the meantime, by reason of the flexibility of the right portion 11, there wilhbe a 'wrapping effect between the end of the shoe. and

the'mid-'portion of the shoe .substantially around the point A.- This effect is combined with the radial movement and the radial pressure exerted by the arm ofthe member 30 at this point. The braking effect is further increased by the outward movement of lthe other; end of lthe shoe and the direct radial movementof the portion of the shoe near the point A. In rthis manner it will be seen that .fthe whole shoe is moved into engagement;

that a wrapping effect is had for substantialv ly two-thirds ofthe full length ofthe shoe and that the whole shoe is used to eifect the braking operation. It is obvious'that when the shoe'ls made symmetrical as I have. shown,

'and when the right and left arms of the member 30 are the same length, that an identical opera-tion is had when the rotation of the drum is in the o posite direction. It can be further seen thaY the end ofthe arm of. the member 30 can be determined b the ratio of thelength of the arm to the di.tance tothe cent'ers of the pins 20 and 40 respectively.` Any givenl characteristics can be imparted to a'given brake by varying this ratio. `1

While the foregoing has been a description of a preferred form of my invention, changes within its scope will appear to one skilled engagement.

radial pressure exerted byin the' art, I do not'wislrtobellimitedother l than by theclaims appended Vhereto.`

Iclaimz-h i l 1. The. combination of a brake drum, a

brake shoe, an anchor pin, a member pivotally 'Iiibunted on the anchor pin and adapted to engage the shoe at a point spaced radially inwards/from the anchor pin, said memberhaving an arm extending circumferentiallyl and4 adapted to.'engage the shoe at a point spaced circumferentially from said anchor .p ln.

2. The combination of a brake drum,a

brake shoe, an anchor pin positioned nearthe friction surface of saidf shoe a member pivot# ally mounted on the anchor pin and adapted 'to engage the shoe at a point spaced radially lnward ,from the anchor pin said membern having an arm extending circumferentially and adapted to engageth'e shoe at a point spaced circumferentially from said anchor PIII. r

an anchor pin, a member pivotallymounted on sai'd anchor pin to engagethe shoe -at a point spaced radially inward from said anchor pin, said member having ax second point 'of engagement with the shoe at a \point lspaced circumferentially from said anchor` pin, whereby circumferential movement of 43.. A mounting fora brake shoeincluding I the shoe causes a radial movement at the said second point of engagement. 4

4.1'l`he combination of'a brakemshoe, an

vanchor pin disposed lremote from the ends of said shoe, a memberpivotally mounted on "said anchor pin to engage the shoe at a point spaced radially in'ward from said anchorpin,`

saidfmember having asecond point of engagement with the' shoe at a point space circumferentially from said anchorkpin, whereby circumferential movementof the shoe creates a radial pressure at thels'aid second point of ,5. The combination of abrake'idrum', friction means associated with the drum, meansA for limiting the circumferential movement of said friction means including a member having a point of Contact lwith said friction` means and mounted on a fixed pivot at 'a point "substantially radially. without and beyond the said point of contact and exerting a radial pressure on said frictqlrnieans proportional movement thereof.'

6. The combination of a brake drum, a brake `shoe disposed within the drum, said shoe havto and dependent upon the circumferential' .ing a deepened channel portioxr, al1-opening in Ione o f theflanges of said deepened channel portion, an anchor in extending through said opening and 'out o contact therewith, a mem-y ber pivotally mounted on said anchor pin, a

pair of aligned slots in thefflanges of said channel portion, asecond pin carried by said Amember and extending through said slots and having lateral engagement. therewith, said into engagement with the drum.

- rocks said niember`about member having arms extending circumferentially relative to said anchor pin whereby circumferential movementof said shoe rocks said member about the anchor pin and forces one of said arms outwardly and into engage-y ment with-said she, thereby urging the shoe 7. The combinationxof a brake drum, a bralie shoe disposed within the drum, said shoe having a deepened channel section in the midportion thereof, an opening in one of the flanges of said deepened channel portion near the lining supporting portion of,the shoe, an anchor pin extending through said opening and out of contact therewith, a member pivotally mounted. and said anchor pin disposed between the ianges of the channel portion, a pair of aligned openings in the flanges of said -channel portion and located radially/inward of said ranchorpim a second pin carriedby said member and extendingI through salid opening andlin engagement therewith, whereby circumferential movementof said shoe the anchor pinand forces the shoe outwardlyand into engagement with the drum.

8. The .combination of a brake drum, a

brake shoe disposed within the drum, said 'shoe having a deepened channel sectioncin the mid-portion thereof, an opening in oneof the flanges of said deepened channel portion, an

anchor pin extending through said opening t and out of contact therewith, a member pivotpin and either arm adapted to engage tween thevfianges of the on said anchor pin disposed bechannel portion, a pair of aligned slotsin tHe flanges `of said channel portion and located radially,inward ally mounted -of said anchor pin, a second pin carried by said member and extending through said slots and having lateral engagement therewith, it being free to move radially thereof, said member having arms extending circumferentially relative to said anchor pin whereby circumferential movement of said. shoe rocks said member about the anchor pin and forces one of said arms outwardly and into engagement with said shoe, thereby urging the shoe intov engagement with the drum.

9. The `combination of' a brake drum, a brake shoe disposed within the drum, ananchor pin notengaging the shoe, said shoe having an inwardly extending portion 'adjacent the anchor pin, amember pivoted about the anchor pin and having a contact" with the said inwardly ex ending portion of said shoe and having a pair of arms extending circumferentially onopposite sides of said anchor the' inner face of the shoe` and exert ya radial force against the inner face of said shoe when the shoe moves circumferentially relative to -sa-id anchor pin. 'l

10. The combination of a brake drum, a substantially y annular brake, shoe disposed within the drum, anv anchor pin not engagsaid inwardly extending portion of said shoe and having'l an arm extending circumferentially of said anchor pin adapted to' engage the inner face of the shoe and exert a radial force against the inner face of said shoe when the shoe movesn circumferentially relative.V to said anchor pin. L

11. The combination of a brake drum, a shoe, an anchor pin, a member pivotally' mounted on said anchor pin and having arms extending in opposite directions circumferentially awa from said-anchor pin, said meniber being e gaged by said shoe at a point between said anchor pin and the center of the drum whereby therircumferential movement of the shoe in eitherdirection causes one or theA other ff the arms of the member to exert a radial. pressure outwardly against the shoe. 12. The combination of a brake drum, a substantially annular shoe, said shoe beingof channel section substantially midway between its ends, an anchor pin disposed near the mid-portion of the she, a member pivotally mounted on said anchor pin vand having 4 arms extending in opposite directions circumvgagement with the drum, -an anchor pin disposed near the friction surfaceof said device, a member pivotally mounted about said anchor pin having a point of engagement with said friction device remote from the frictional surface thereof and having a second point of engagement circumferentially spaced. from the first point of engagement whereby circumferential movement of said friction device rotates tlie'member about the anchor pin and directs a radial force between said friction device and said drum near the said second point of engagement of the meinber with the said friction device. v

14. An anchorage for a brake shoe comprising a member mounted on a fixed pivot and engaging the shoe at a point Substantially between said pivot and the center of the brake and adapted to force the shoe outwardly in response to circumferential movevciment thereof. `f

15. In a brake having a fixed supporting part and a shoe part, an anchorage for 'the shoe comprising a member pivotally mounted on the supporting part and having points of contact with the shoe spaced substantially a y right angle from each other about the pivotal center of said member, oneof( said points ly! ing in the radial Zone of said ce ter whereby one of said points'of contact moves substantially radially. when thevother of said 'points moves circumferentially.

16. In a brake comprising. a shoe part and a lrelatively fixed-supporting part, an anchorage comprising a substantially T-shaped i member'pivotally mounted on the supporting part, and having an arm engageable with the shoe and havin'goppositely extending arms selectively engageable with the shoe depend ing on the movement of the shoe relative to the fixed (supporting part.

F`17. A mounting for a brake shoe including an anchor pin, a member pivotallymounted" on said anchor pin to, engage the shoe at a point spaced radially away from' said anchor pin, said member having a second pointlof engagement with the shoe. at a point spaced circumferentially from said anchor pin,

whereby circumferential movement of the ond point of enga ement.

shoe causes a radiagl movement at the said sec- 18. In a brake, the combination of adrum,

a substantially/annular brake' shoe having#4 'between the anchor spaced ends, means engaging said endsfor.

forcing the shoe into engagement with the drum, said shoe having a relatively rigid midportion opposite its ends,` an anchor pin d1sposed adjacent said relatively rigid midportion and la member pivotally mounted o11` said anchor, pin and engaging the relatively rigid portion` of said shoe atk a pointspaced pin and the center of the brake.v v 1 i 19. An anchoragev for a `friction device adapted to be associated with a brake drum,

including a 4member pivoted about a lxed point and contacting with the yfriction deviceand contacting therewith at a point remote from the fixed point, and adapted to move `radially when said. memv said 'friction device ber is rocked.l y 4 s i In testimony whereof, I hereunto'ailix my.

signature.

JOHN SNED. 

